Subprocess: [6/7] Refactored isolator tests to use parentHook.
Subprocess: [6/7] Refactored isolator tests to use parentHook.

The isolator tests parent process isolates the child while the child
is being blocked. This this the exact patter of a parentHook.

Review: https://reviews.apache.org/r/45236/

kaysoky/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,verizonlabs/mesos,zmalik/mesos,kaysoky/mesos,reneploetz/mesos,verizonlabs/mesos,jpeach/mesos,jpeach/mesos,neilconway/mesos,kaysoky/mesos,chhsia0/mesos,reneploetz/mesos,asamerh4/mesos,dforsyth/mesos,reneploetz/mesos,andschwa/mesos,chhsia0/mesos,neilconway/mesos,dforsyth/mesos,yuquanshan/customizedMesos,gsantovena/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,dforsyth/mesos,craimbert/mesos,zmalik/mesos,jpeach/mesos,andschwa/mesos,kaysoky/mesos,zmalik/mesos,yuquanshan/customizedMesos,abudnik/mesos,yuquanshan/customizedMesos,asamerh4/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,abudnik/mesos,verizonlabs/mesos,craimbert/mesos,kaysoky/mesos,Gilbert88/mesos,chhsia0/mesos,reneploetz/mesos,asamerh4/mesos,abudnik/mesos,gsantovena/mesos,kaysoky/mesos,neilconway/mesos,gsantovena/mesos,Gilbert88/mesos,craimbert/mesos,abudnik/mesos,reneploetz/mesos,dforsyth/mesos,chhsia0/mesos,Aman-Jain-14/customizedMesos,craimbert/mesos,dforsyth/mesos,asamerh4/mesos,asamerh4/mesos,kaysoky/mesos,gsantovena/mesos,zmalik/mesos,andschwa/mesos,yuquanshan/customizedMesos,chhsia0/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,craimbert/mesos,abudnik/mesos,abudnik/mesos,andschwa/mesos,chhsia0/mesos,Gilbert88/mesos,jpeach/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,dforsyth/mesos,verizonlabs/mesos,gsantovena/mesos,zmalik/mesos,zmalik/mesos,jpeach/mesos,neilconway/mesos,Gilbert88/mesos,craimbert/mesos,yuquanshan/customizedMesos,verizonlabs/mesos,dforsyth/mesos,zmalik/mesos,verizonlabs/mesos,andschwa/mesos,yuquanshan/customizedMesos,andschwa/mesos,Gilbert88/mesos,gsantovena/mesos,jpeach/mesos,andschwa/mesos,verizonlabs/mesos,Gilbert88/mesos,asamerh4/mesos,Aman-Jain-14/customizedMesos,reneploetz/mesos,chhsia0/mesos,gsantovena/mesos,neilconway/mesos,neilconway/mesos,reneploetz/mesos